Passage VII
When a temperature difference (△T) exists between the ends of an insulated metal rod (see Figure 1), heat flows from one end of the rod to the either. (△T = TH - TC, where TH and TC represent the temperature of the hotter end and the colder end, respectively.)
The rate at which heat flows is called the heat transfer rate, R.
The following data apply to insulated copper rods. Table 1 gives R versus △T for a 5 cm long rod with a cross-sectional area of 3 cm2. In Figure 2, R is plotted against length for rods having a △T of 30℃ and a cross-sectional area of 3 cm2. In Figure 3, R is plotted against cross-sectional area for 5 cm long rods with a △T of 30°C.
36. The data in the passage best support the hypothesis that the value of R decreases as which of the following properties of insulated copper rods increases?
Your Answer is
Correct Answer is F
Explanation
As can be seen from figure 2, as the abscissa length increases, the ordinate R decreases